If less than the correct amount of tax imposed by section
3101,
3111,
3201,
3221, or
3402 is paid with respect to any payment of wages or compensation, proper adjustments, with respect to both the tax and the amount to be deducted, shall be made, without interest, in such manner and at such times as the Secretary may by regulations prescribe.

(2) United States as employer

For purposes of this subsection, in the case of remuneration received from the United States or a wholly-owned instrumentality thereof during any calendar year, each head of a Federal agency or instrumentality who makes a return pursuant to section
3122 and each agent, designated by the head of a Federal agency or instrumentality, who makes a return pursuant to such section shall be deemed a separate employer.

(3) Guam or American Samoa as employer

For purposes of this subsection, in the case of remuneration received during any calendar year from the Government of Guam, the Government of American Samoa, a political subdivision of either, or any instrumentality of any one or more of the foregoing which is wholly owned thereby, the Governor of Guam, the Governor of American Samoa, and each agent designated by either who makes a return pursuant to section
3125 shall be deemed a separate employer.

(4) District of Columbia as employer

For purposes of this subsection, in the case of remuneration received during any calendar year from the District of Columbia or any instrumentality which is wholly owned thereby, the Mayor of the District of Columbia and each agent designated by him who makes a return pursuant to section
3125 shall be deemed a separate employer.

(5) States and political subdivisions as employer

For purposes of this subsection, in the case of remuneration received from a State or any political subdivision thereof (or any instrumentality of any one or more of the foregoing which is wholly owned thereby) during any calendar year, each head of an agency or instrumentality, and each agent designated by either, who makes a return pursuant to section
3125 shall be deemed a separate employer.

(b) Underpayments

If less than the correct amount of tax imposed by section
3101,
3111,
3201,
3221, or
3402 is paid or deducted with respect to any payment of wages or compensation and the underpayment cannot be adjusted under subsection (a) of this section, the amount of the underpayment shall be assessed and collected in such manner and at such times (subject to the statute of limitations properly applicable thereto) as the Secretary may by regulations prescribe.

Subsec. (a)(4). Pub. L. 94–455, § 1906(a)(13), substituted “Mayor of the District of Columbia and each agent designated by him” for “Commissioners of the District of Columbia and each agent designated by them” after “owned thereby, the”.

Amendment by Pub. L. 99–272applicable to services performed after Mar. 31, 1986, see section 13205(d)(1) ofPub. L. 99–272, set out as a note under section
3121 of this title.

Effective Date of 1976 Amendment

Amendment by Pub. L. 94–455effective on first day of first month which begins more than 90 days after Oct. 4, 1976, see section 1906(d)(1) ofPub. L. 94–455, set out as a note under section
6013 of this title.

Effective Date of 1965 Amendment

Amendment by Pub. L. 89–97applicable with respect to services performed after quarter ending Sept. 30, 1965, and after quarter in which Secretary of the Treasury receives a certification from Commissioners of District of Columbia expressing their desire to have insurance system established by sections
401 et seq. and 1395c et seq. of Title 42, The Public Health and Welfare, extended to officers and employees coming under provisions of such amendments, see section 317(g) ofPub. L. 89–97, set out as a note under section
410 of Title
42.

Effective Date of 1960 Amendment

Amendment by Pub. L. 86–778applicable only with respect to (1) service in the employ of the Government of Guam or any political subdivision thereof, or any instrumentality of any one or more of the foregoing wholly owned thereby, which is performed after 1960 and after the calendar quarter in which the Secretary of the Treasury receives a certification by the Governor of Guam that legislation has been enacted by the Government of Guam expressing its desire to have the insurance system established by title II of the Social Security Act, section
401 et seq. of Title 42, The Public Health and Welfare, extended to the officers and employees of such Government and such political subdivisions and instrumentalities, and (2) service in the employ of the Government of American Samoa or any political subdivision thereof or any instrumentality of any one or more of the foregoing wholly owned thereby, which is performed after 1960 and after the calendar quarter in which the Secretary of the Treasury receives a certification by the Governor of American Samoa that the Government of American Samoa desires to have the insurance system established by title II of the Social Security Act, section
401 et seq. of Title 42, extended to the officers and employees of such Government and such political subdivisions and instrumentalities, see section 103(v)(1) ofPub. L. 86–778, set out as a note under section
402 of Title
42.

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